I have the Galaxy J7 have had this problem with pretty much ALL the church apps in the past 3 weeks, the WORST being the Choir app, which has been buggy since day 1 and has always been in serious need of fixes, now it won't even run and I finally just had to remove it.
I'm sensing the problem may be in how much on board storage a particular phone has. The other issue is, whatever version of OS its running the newer updates to the Apps will eventually no longer run on the older OS.
Mine comes with 16 Gig and its giving me fits that I've 'run out of space" So one way to reduce the crashing is making sure for those apps which can be set to use the external memory helps tremendously... I had to go through a major cleanup of my phone to move everything possible. Bottom line, its time I moved to a newer phone, but $$$ can't and I will have to stay with this one until it crashes. It seems now every Sunday I must go through and remove as many "caches' from every app possible before Church Apps will work. I'm the Music Director and depend upon the Music app heavily because we do not have anyone to play the organ/piano for our meetings. I just use the Music App and this has worked for us for several years now. I've got my phone connected to the church sound system so everyone can hear the hymns and we use the version with the voices singing the words too, Under present circumstances, hearing the words has helped our meetings! (just have to remember to turn all my notifications off so they don't go off during the music!)